1. 4SQRP Paddles - https://www.4sqrp.com/kits/4S-Key/4S-Key-Builders-Manual.pdf

2. iCW -  internet CW - https://sites.google.com/site/icwoip

3. SDR Software Applications (Програмні додатки SDR) - https://wiki.radioreference.com/index.php/SDR_Software_Applications

4. Ham Radio Wire Antennas & Grounding Information (Дротові антени любительського радіо) - https://www.wa2ooo.com/wireantenna.html

** Ham Radio Wire Antenna Tips - https://www.hamradiosecrets.com/ham-radio-wire-antenna.html

5. Radio PCB projects - http://www.spectrumcomms.co.uk/Radio_PCB_Projects.htm

73 de UT2AB